[jdk11u-dev] RFR: 8285690: CloneableReference subtest should not throw CloneNotSupportedException

[Goetz Lindenmaier]

I backport this for parity with 11.0.19-oracle.

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Commit messages:
 - Backport 2d8d1402147f6ddd15732ce7098a8438317a2681

Changes: https://git.openjdk.org/jdk11u-dev/pull/1680/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1680&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8285690
  Stats: 5 lines in 1 file changed: 2 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1680.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1680/head:pull/1680

PR: https://git.openjdk.org/jdk11u-dev/pull/1680